Hieam t



(No Model.) I

H. T.'KING.

WRENCH.

No. 320,797. Patented June 23, 1885.

UNITED STATES PATENT OFFICE.

HIRAM T. KING, or RoeHnsTEanEw YORK.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 320,797, dated June 23, 1885.

(No model.)

To aZZ whom, it may concern.-

Be it known that I, HIRAM T. KING, of the city of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Wrenches; and I do hereby declare that the following is a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, in which- Figure 1 is a face view of a wrench provided with my improvement. Fig. 2 is an edge View of the same, looking at right angles to Fig. 1. Fig. 3 is a horizontal section on an enlarged scale in line 00 0c of Fig. 2, showing the means for operating the .movable jaw. Fig. 4 is a perspective view of oneof the dogs for operating the movable jaw. Fig. 5 is a similar view of the eccentric or cam 011 which the dog rests.

My improvement relates to means for operating the movable jaw in wrenches, Vises, grips, and other instruments of a similar nature; and it consists, substantially, of an eccentric operated by a lever and a toothed dog resting thereon, in combination with. the ratchet-bar of the wrench, as hereinafter described, whereby, in addition to locking the movable jaw against the article to be clamped, it also serves as afced and as a means to press the jaw forward with great power, as will be more fully set forth.

In the drawings, A shows the ratchet-bar, and B the fixed jaw or head of a wrench. The ratchet-teeth a differ from those in most wrenches by standing forward in the direction of the fixed jaw, as shown most clearly in Fig. 3.

My improvement is as follows:

C is the movable. jaw of the wrench, which is provided with a socket and slides on the ratchet-bar in the usual manner. The shank of this jaw is made of more than the usual length for the attachment of the operating devices.

D is an eccentric or cam having two journals, b b, one on each side, which fit in sockets or bearings of the movable jaw, so as to turn freely. At one end, and outside the jaw, a head, 0, is attached to or forms a part of the journal on that side, and to this is attached a lever, E, by turning which the eccentric is operated. The eccentric, journals, head, and lever are preferably all made in one piece.

G is a dog, consisting of an eye, (I, which fits on the eccentric D, and an arm, f, at the outer end of which are a set of ratchet-teeth, g,which stand reversely to the teeth a of the ratchet bar of the wrench, and are adapted to engage therewith. The eye of the dog is provided with a slot, ii, that extends part way around the circumference, through which slot passes a pin or screw, 7c, attached to the eccentric, as

It will be seen that the movable jaw, can

slide freely up over the ratchet to clamp any article, but that it cannot slide back again, owing to the spring pressing the dog up and engaging the reverse teeth. Therefore, to retract the jaw, it is necessary to throw the (log off by some positive means. This is accomplished by means of the sloth in the eye of the dog and the pin or screw of the eccentric, which pin, when the lever is thrown back, strikes the end of the slot and draws the end of the dog back from the ratchet. In this condition thejaw rides free.

The pin and slot form an essential feature of my invention, as their use enables the dog to be thrown off from the ratchet and against the spring, some device being necessary for the purpose, and this is very simple and effective.

WVhen the lever is turned forward, relieving the pin in the slot, the spring will force the dog up again in engagement with. the ratchetbar, and a further movement of the lever will turn the eccentric in the eye of the dog, forcing the latter down against the ratchet-bar, and

consequently feeding the movable jaw up toward the stationary one with a positive force. Thus when the movable jaw has been slid up to meet the article to be clamped pressure can be applied by turning the eccentric, as described.

In ordinary wrenches a single eccentric and dog are sufficient; but in some cases it is necessary to use two, as shown in Fig. 3. This is especially the case in Vises, grips, jacks, 850., where it is necessary to clamp with great power. In the case of the use of two, the levers are attached on opposite sides, as shown. In such case the eccentrics are used alternately, one serving as a stop to hold the strain while the other is pushing forward, and vice versa.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is 7 1. The combination, with the ratchet-bar and movable jaw, of an eccentric mounted in the jaw and operated by a lever, a dog resting on the eccentric provided with teeth that engage rcversely with the teeth of the ratchetbar, a spring that rests behind the dog to press it up to place, and a pin or screw on the eccentric that passes through a slot in the eye of the dog, as shown and described, and for the purpose specified.

2. The combination, with the ratchet -bar and movable jaw, of two eccentrics mounted in the jaw, two dogs resting on the eccentrics, with springs for pressing the dogs up to place, and pins in the eccentrics which pass through slots in the eyes of the dogs, said devices being used in alternation, one serving as a stop against back action of the jaw while the other is moving it forward, as herein set forth.

In witness whereof I have hereunto signed 3 5 H. T. KING.

WVitnesses:

R. F. OSGOOD, NVM. J. MoPHERsoN. 

